Injection oiler



United States Patent O INJECTION OILER Carl J. Carlson and Clarence R. Berry, Omaha, Nebr.

Application December 3, .1956, Serial No. 625,824

7 Claims. (Cl. 184-56) This invention relates. to injection oilers.

It is an object of the present invention to provide an injection oiler for the automatic injection of oil into a forced stream of air as a vapor or mist to be carried into a tool or device, being especially adapted for air tools of portable nature.

It is another object of the present invention to provide an injection oiler of the, above type which will provide instant lubrication for all portable pneumatic tools working on, an intermittent principle.

Other objects of the invention are to provide an injection oiler bearing the above objects in mind which is of simple construction, has a minimum number of parts, is inexpensive to manufacture and efficient in operation and use.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Figure l is a vertical sectional view of a preferred embodiment of the present invention shown partly in elevation;

Fig. 2 is a perspective view shown alone of the injector assembly;

Fig. 3 is an enlarged longitudinal vertical sectional view of the injector assembly;

Fig. 4 is a transverse vertical sectional view taken along the line 44 of Fig. 3; and

Fig. 5 is an exploded perspective view of the parts comprising the injector assembly of Fig. 2.

Referring now more in detail to the drawing, represents an outside housing having a closed oil supply compartment 11 and an air line 12,-substantially as illustrated.

A main valve body 13 is positioned within the outside housing 19 above the oil supply compartment 11 and includes an oil inlet 14 which extends downwardly into the oil supply compartment 11 where it is surrounded by the screen 15. The inlet 14 includes a seal ring 16. The main body 13 is also sealed with-in the housing 10, as at 17.

A cylindrical valve housing 17 is integrally formed at one end with a reduced externally threaded extension 18 which is screwed into the internally threaded bore 19 within the main body 13. A seal ring 12' is positioned intermediate the vaive housing 17' of the main body 13. The valve housing 17' is provided with the internally threaded bore 2i! which extends inwardly through the rear end thereof forwardly to communicate with the valve chamber 21 which in turn communicates with the injector outlet port 22 which extends through the nozzle 23 at the forward end of the valve housing. The forward end of the valve housing 17 is also provided with the conically arranged air ports or vents 24 which communicate with the mixing chamber 25 at the forward end of the outside housing 10 and which connects with the outlet 26. The outside housing 10 is provided with the rectangular hollow portion 27 which houses the main body 13 and which communicates with the mixing chamber 25 by the cylindrical bore 28 2,826,268 PatentedMar. 11, .1958

within which is positioned the valve housing 17 (Fig. 1).

An externally threaded adjustable plug 29 is screwed into the internally threaded bore 20 and is provided with an inlet 30 the forward end of which serves as a valve seat.

A control valve or injector 31 is provided at its forward end with the conical tip or valve 32 adapted to seat within the inner end of the injector outlet bore. 22 and at its rear end with a conical valve 33 adapted to seat with in the forward end of the inlet 39.

The valve housing 17' is provided with an annular air. port 34- Which connects the air line 12 with the vair vents 24. a

In operation, air pressure is applied to the air line 12 enclosed in the outside housing 10, which will load the valve through the injector outlet 22. This will also load the oil chamber 11 with the same, amount of pressure by seepage through the rear valve seat adjustment 29. This seepage occurs around the rear valve adjustment 29.. The valve 31 is now at rest. When the valve or trigger out-he device to be oiled is opened, the pressure on the air line 12 will drop, causing the valve 32 to close the'port 22, or the valve 32 is forced into the port 22 byhigher pressure in the chamber 11, 'drawingoil by pressure upihe -inlet;.14 into the valve chamber 21.

When the valve or trigger is closed again, the pressure on the port 22 is raised above the pressure in the oil chamher 11, causing the valve 31 and more particularly the rear end portion 33 thereof to return to the valve port 30 as shown in dotted outline in Fig. 3. The opening and clos ing of the valve or trigger to be oiled will cause the valve 31 and more particuiarly the conical tips 32 and 33 thereof to oscillate between the ports 22 and 30, thereby injecting a very small amount of oil through the port 22. The air pressure flowing through the air port 34 and out through the vents 2 2 will vaporize the oil into the air stream and the mixing chamber 25, thereby oiling the air tool or device attached to the outlet 26 of the injection oiler.

By adjustment of the rear valve seat member 29, the amount of oil injected is controlled.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims. 1

What we claim as new and desire to protect by Letters Patent of the United States:

1. An injection oiler comprising a main body having a central compartment, a valve housing connected to said main body and communicating with said central compartment at one end, said valve housing at the other end having an injector outlet port a rear valve seat adjustment member adjustable within the valve housing near the end thereof adjacent said central compartment, said rear valve seat adjustment member having an inlet port connecting said central compartment with the interior of said valve housing, a valve adapted to reciprocate within said valve housing and being provided at its forward end with a conical first valve and at its rear end with a second conical valve, said first conical valve being adapted to seat within said injector outlet port, said second valve being adapted to seat within said inlet port, said main body having an inlet communicating with the central compartment thereof, a closed oil reservoir connected to the outer end of said inlet, an annular air port on said valve housing near said injector outlet port, an oil and air mixing chamber at the forward end of said valve housing, said valve housing having a plurality of angularly spaced, comically arranged air vents connecting said annular air port with said mixing chamber, a compressed air line communicating with said annular air port, and an outside housing enclosing said main body, valve housing, mixing chamber, closed oil reservoir and air line, said outside housing having an outlet for connecting the mixing chamber with the air tool or device attached to the injector oiler.

2. An injection oiler according to claim 1, including a screen surrounding said inlet Within said closed oil reservoir.

3. An injection oiler according to claim 2, said main body being substantially rectangular and having an internally threaded bore extending inwardly through one side thereof communicating with said central compartment, said valve housing being substantially cylindrical and being integrally formed with an externally threaded reduced extension adapted to be screwed into said main body internally threaded bore, said outside housing having a substantially rectangular hollow compartment receiving said main body therewithin, said outside housing having a hollow cylindrical compartment connecting said main body compartment with said mixing chamber and receiving said valve housing therewithin, said inlet extending downwardly from said main body through said outside housing and into said closed oil reservoir, a seal ring intermediate the end of said valve housing and the adjacent face of said main body, and sealing means between said main body and outside housing and said main body inlet and outside housing.

4. An injection oiler according to claim 3, said air line 7 communicating with said outside housing hollow cylindrical compartment containing said valve housing and with said valve housing annular air port.

5. An injection oiler according to claim 4-, said valve housing being formed with a nozzle surrounding the forward end of said injector outlet port, said nozzle extending into said mixing chamber.

6. An injection oiler according to claim 5, the interior of said valve housing being internally threaded, said rear valve seat adjustment member being externally threaded and adapted to be adjusted within the internally threaded portion of said valve housing whereby to control the amount of oil injected into said mixing chamber by varying the distance of said rear valve seat inlet to said injector outlet port.

7. An injection oiler according to claim 6, the forward end of said valve housing within said mixing chamber having a circular recess surrounding said nozzle and communicating with said air vents, said annular air port defining a frusto-conical section of said valve housing extending parallel to the conically arranged air ports.

References Cited in the file of this patent UNITED STATES PATENTS 982,927 Bayles Jan. 31, 1911 1,977,377 De Long Oct. 16, 1934 2,707,657 Paasche May 3, 1955 

